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In most nightclub environments, dark wool, cotton or synthetic slacks mate well with a button up shirt. Gentlemen in nightclubs should use caution to distinguish between button-up shirts appropriate for nightclub wear and the dressier, somewhat stodgier button-up shirts intended for professional office wear.
If the invitation asks for Cocktail Attire, men should wear: dark to mid-gray suit. dress shirt in white or a muted color. necktie in subtle patterns or plains. pocket square. black dress shoes with leather sole. Over the Calf Socks that match the trousers or something else in your outfit. Of course make sure you are clean shaven and you have a proper hair cut.